How do you change the app store's large icon on iTunes connect?

Question

I need to change the large app icon (512x512) for app store. I can\'t find how to to this through iTunes Connect. I\'s possible change the app screenshots though. I read the

Answer 1

I was confused, because I used to know the "upload icon" field from my iOS app, but did not see the field when I wanted to submit my Mac OS X desktop app.

The answer above indicates that you can upload an icon only for updates, which is true for iOS apps, but for Mac OS X apps, you can never upload a separate icon file, instead the 512 icon is uploaded together with your binary bundle:

"Note: You will not be asked to provide a large icon when adding your Mac OS X app because it will be uploaded later as part of the binary."

from p56 of https://itunesconnect.apple.com/docs/iTunesConnect_DeveloperGuide.pdf